Dear Maintainer,

gfs2-utils fails to build from source on arm64:

/usr/include/aarch64-linux-gnu/asm/sigcontext.h:81:9: error: unknown type name '__u128'; did you mean '__u32'?

Root cause:
gfs2-utils provides an internal compatibility header gfs2/include/linux/types.h which is exposed via -I compiler flags.
When source files in gfs2/edit (extended.c, journal.c, hexedit.c) include <signal.h>, glibc's <bits/sigcontext.h> includes the kernel UAPI header <asm/sigcontext.h>, which in turn includes <linux/types.h>.
Due to the include path order, the compiler includes the internal gfs2/include/linux/types.h instead of system /usr/include/linux/types.h.
The internal header only defines endian types (__le16 through __be64) and lacks the 128-bit kernel integer types (__s128 and __u128) used by arm64's struct fpsimd_context.

Fix:
Define __s128 and __u128 under #ifdef __SIZEOF_INT128__ in gfs2/include/linux/types.h.
Patch is attached below.
--- a/gfs2/include/linux/types.h
+++ b/gfs2/include/linux/types.h
@@ -24,4 +24,9 @@
 typedef uint64_t __bitwise __le64;
 typedef uint64_t __bitwise __be64;

+#ifdef __SIZEOF_INT128__
+typedef __signed__ __int128 __s128 __attribute__((aligned(16)));
+typedef unsigned __int128 __u128 __attribute__((aligned(16)));
+#endif
+
 #endif /* LINUX_TYPES_H */

We believe that the bug you reported is fixed in the latest version of
gfs2-utils, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1150398@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Valentin Vidic <vvidic@debian.org> (supplier of updated gfs2-utils package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Fri, 09 Oct 2026 20:03:09 +0200
Source: gfs2-utils
Architecture: source
Version: 3.6.1-3
Distribution: unstable
Urgency: medium
Maintainer: Debian HA Maintainers <debian-ha-maintainers@lists.alioth.debian.org>
Changed-By: Valentin Vidic <vvidic@debian.org>
Closes: 1150398
Changes:
 gfs2-utils (3.6.1-3) unstable; urgency=medium
 .
   * debian/patches: fix FTBFS on arm64 (Closes: #1150398)
   * debian/watch: use gitlab instead of pagure
   * debian/control: remove optional fields
   * debian/upstream/metadata: add gitlab links
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